Dissolve gerrit-util-http top-level directory

Change-Id: Ib1a71b8e3c9787dc71f8e177cad499856195f543

java/com/google/gerrit/util/http/BUILD

@@ -0,0 +1,6 @@
+java_library(
+    name = "http",
+    srcs = glob(["**/*.java"]),
+    visibility = ["//visibility:public"],
+    deps = ["//lib:servlet-api-3_1"],
+)

java/com/google/gerrit/util/http/RequestUtil.java

@@ -0,0 +1,60 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.util.http;
+
+import javax.servlet.http.HttpServletRequest;
+
+/** Utilities for manipulating HTTP request objects. */
+public class RequestUtil {
+  /** HTTP request attribute for storing the Throwable that caused an error condition. */
+  private static final String ATTRIBUTE_ERROR_TRACE =
+      RequestUtil.class.getName() + "/ErrorTraceThrowable";
+
+  public static void setErrorTraceAttribute(HttpServletRequest req, Throwable t) {
+    req.setAttribute(ATTRIBUTE_ERROR_TRACE, t);
+  }
+
+  public static Throwable getErrorTraceAttribute(HttpServletRequest req) {
+    return (Throwable) req.getAttribute(ATTRIBUTE_ERROR_TRACE);
+  }
+
+  /**
+   * @return the same value as {@link HttpServletRequest#getPathInfo()}, but without decoding
+   *     URL-encoded characters.
+   */
+  public static String getEncodedPathInfo(HttpServletRequest req) {
+    // CS IGNORE LineLength FOR NEXT 3 LINES. REASON: URL.
+    // Based on com.google.guice.ServletDefinition$1#getPathInfo() from:
+    // https://github.com/google/guice/blob/41c126f99d6309886a0ded2ac729033d755e1593/extensions/servlet/src/com/google/inject/servlet/ServletDefinition.java
+    String servletPath = req.getServletPath();
+    int servletPathLength = servletPath.length();
+    String requestUri = req.getRequestURI();
+    String pathInfo =
+        requestUri.substring(req.getContextPath().length()).replaceAll("[/]{2,}", "/");
+    if (pathInfo.startsWith(servletPath)) {
+      pathInfo = pathInfo.substring(servletPathLength);
+      // Corner case: when servlet path & request path match exactly (without
+      // trailing '/'), then pathinfo is null.
+      if (pathInfo.isEmpty() && servletPathLength > 0) {
+        pathInfo = null;
+      }
+    } else {
+      pathInfo = null;
+    }
+    return pathInfo;
+  }
+
+  private RequestUtil() {}
+}